Modern JavaScript Patterns

Comprehensive guide for mastering modern JavaScript (ES6+) features, functional programming patterns, and best practices for writing clean, maintainable, and performant code.

When to Use This Skill

• Refactoring legacy JavaScript to modern syntax
• Implementing functional programming patterns
• Optimizing JavaScript performance
• Writing maintainable and readable code
• Working with asynchronous operations
• Building modern web applications
• Migrating from callbacks to Promises/async-await
• Implementing data transformation pipelines

Detailed patterns and worked examples

Detailed pattern documentation lives in references/details.md. Read that file when the navigation tier above is insufficient.

Best Practices

1. Use const by default: Only use let when reassignment is needed
2. Prefer arrow functions: Especially for callbacks
3. Use template literals: Instead of string concatenation
4. Destructure objects and arrays: For cleaner code
5. Use async/await: Instead of Promise chains
6. Avoid mutating data: Use spread operator and array methods
7. Use optional chaining: Prevent "Cannot read property of undefined"